#include <stdio.h>
#include<string.h>
int main(void){

unsigned long long m;
int r=0;
int i;
int k=0;
int q=0;
int n=0;
char s[100];
scanf("%s",s);
for(i=0;i<strlen(s);i++){
	if(s[i]=='O'&&s[i+1]=='O'&&s[i+2]=='O'){
		q=i+1;
		//printf("E%d\n",i);
		break;
	}else if(s[i]=='X'&s[i+1]=='X'&&s[i+2]=='X'){
		
		n=i+1;
		//printf("W%d\n",i);
		break;
	}

	
	
	
	
	
	
	
}
if((q!=0)||(n!=0)){
	if(q<n){
		printf("West\n");
	}else{
		printf("East\n");
		
	}
	
	
	
}else{
	printf("NA\n");
	
}

return 0;
}